Specifications for the EM 277 PROFIBUS-DP Module

Transcription

1 A.12 Specifications for the EM 277 PROFIBUS-DP Module Table A-16 Specifications for the EM 277 PROFIBUS-DP Module Physical Size Dimensions (W x H x D) Weight Power loss (dissipation) Description Order Number 71 mm x 80 mm x 62 mm 175 g 2.5 W EM 277 PROFIBUS-DP 6ES AA20-0XA0 Communication Features Number of Ports Electrical interface Isolation (external signal to PLC logic) PROFIBUS-DP/MPI baud rates (set automatically) Protocols Cable Length Up to 93.75K baud 187.5K baud 500K baud 1 to 1.5M baud 3 to 12M baud Network Capabilities Station address settings Maximum stations per segment Maximum stations per network MPI Connections 1 port RS VAC (Galvanic) 9.6, 19.2, 45.45, 93.75, 187.5, and 500K baud; 1, 1.5, 3, 6, and12m baud PROFIBUS-DP slave and MPI slave 1200 m 1000 m 400 m 200 m 100 m Power Consumption +5 VDC (from I/O bus) 150 ma 24 VDC Input Power Requirements Voltage range Maximum current Module only with port active Add 90 ma of 5V port load Add 120 ma of 24V port load Ripple noise (<10 MHz) 1 Isolated (input power to module logic) 5 VDC Power on Communication Port Maximum current per port Transformer isolation from module logic and from 24 VDC input power 24 VDC Power on Communication Port Voltage range Maximum current per port Current limit Isolated 0-99 (set by rotary switches) , up to 99 EM277 stations 6 total, 2 reserved (1 for PG and 1 for OP) 20.4 to 28.8 VDC (Class 2 or sensor power from PLC) 30 ma 60 ma 180 ma <1 V peak to peak (maximum) 500 VAC for 1 minute 90 ma 500 VAC for 1 minute 20.4 to 28.8 VDC 120 ma 0.7 to 2.4 A Not isolated, same circuit as input 24 VDC 1 No power is supplied to module logic by the 24 VDC supply. 24 VDC supplies power for the communication port. A-50

2 Compatibility The EM 277 PROFIBUS-DP slave module is an intelligent expansion module designed to work with the S7-200 PLCs shown in Table A-17. Table A-17 EM 277 PROFIBUS-DP Module Compatibility with S7-200 PLCs CPU Description Order Number CPU 222 Rel or greater CPU 222 DC/DC/DC 6ES AB21-0XB0 CPU 222 AC/DC/Relay 6ES BB21-0XB0 CPU 224 Rel or greater CPU 224 DC/DC/DC 6ES AD21-0XB0 CPU 224 AC/DC/Relay 6ES BD21-0XB0 CPU 226 Rel or greater CPU 226 DC/DC/DC 6ES AD21-0XB0 CPU 226 AC/DC/Relay 6ES BD21-0XB0 Address Switches and LEDs The address switches and status LEDs are located on the front of the module as shown in Figure A-26. The EM 277 status LEDs are shown in Table A-20. Address Switches: x10=sets the most significant digit of the address x1= sets the least significant digit of the address x10 x1 CPU FAULT POWER DP ERROR DX MODE M L+ Input Power: =Earth ground M =24 VDC return L+ =24 VDC DP Slave Port Connector Figure A-26 Front View of the EM 277 PROFIBUS-DP Module A-51

3 DP Slave Port Connector The pin-out for the DP slave port connector is shown in Figure A pin D Female Connector Pin # Pin Sub D Connector Pin-out Description Chassis ground, tied to the connector shell 24V Return (same as M on terminal block) Isolated Signal B (RxD/TxD+) Isolated Request to Send (TTL level) Isolated +5V Return Isolated +5V at 90 ma +24V (120 ma maximum, with reverse voltage protection diode) Isolated Signal A (RxD/TxD-) No Connection Note: Isolated means 500V of isolation from digital logic and 24V input power. Figure A-27 Pin-out for the DP Slave Port Connector Distributed Peripheral (DP) Standard Communications PROFIBUS-DP (or DP Standard) is a remote I/O communication protocol defined by the European Standard EN Devices that adhere to this standard are compatible even though they are manufactured by different companies. DP stands for distributed peripherals, that is, remote I/O. PROFIBUS stands for Process Field Bus. The EM 277 PROFIBUS-DP module has implemented the DP Standard protocol as defined for slave devices in the following communication protocol standards: EN (PROFIBUS) describes the bus access and transfer protocol and specifies the properties of the data transfer medium. EN (DP Standard) describes the high-speed cyclic exchange of data between DP masters and DP slaves. This standard defines the procedures for configuration and parameter assignment, explains how cyclic data exchange with distributed I/O functions, and lists the diagnostic options which are supported. A DP master is configured to know the addresses, slave device types, and any parameter assignment information that the slaves require. The master is also told where to place data that is read from the slaves (inputs) and where to get the data to write to the slaves (outputs). The DP master establishes the network and then initializes its DP slave devices. The master writes the parameter assignment information and I/O configuration to the slave. The master then reads the diagnostics from the slave to verify that the DP slave accepted the parameters and the I/O configuration. The master then begins to exchange I/O data with the slave. Each transaction with the slave writes outputs and reads inputs. The data exchange mode continues indefinitely. The slave devices can notify the master if there is an exception condition and the master then reads the diagnostic information from the slave. A-52

4 Once a DP master has written the parameters and I/O configuration to a DP slave, and the slave has accepted the parameters and configuration from the master, the master now owns that slave. The slave only accepts write requests from the master that owns it. Other masters on the network can read the slave s inputs and outputs, but they cannot write anything to the slave. Using the EM 277 to Connect an S7-200 CPU to the Network as a DP Slave The S7-200 CPU can be connected to a PROFIBUS-DP network through the EM 277 PROFIBUS-DP expansion slave module. The EM 277 is connected to the S7-200 CPU through the serial I/O bus. The PROFIBUS network is connected to the EM 277 PROFIBUS-DP module through its DP communication port. This port operates at any PROFIBUS baud rate between 9600 baud and 12 Mbaud. (See Table A-16 for supported baud rates.) As a DP slave device, the EM 277 module accepts several different I/O configurations from the master to transfer different amounts of data to and from the master. This feature allows you to tailor the amount of data transferred to meet the requirements of the application. Unlike many DP devices, the EM 277 module does not transfer only I/O data. The EM 277 moves data to and from a block of variable memory defined in the S7-200 CPU. This allows you to exchange any type of data with the master. Inputs, counter values, timer values, or other calculated values can be transferred to the master by first moving the data to the variable memory in the S7-200 CPU. Likewise, data from the master is stored in variable memory in the S7-200 CPU and can be moved to other data areas. The DP port of the EM 277 PROFIBUS-DP module can be attached to a DP master on the network and still communicate as an MPI slave with other master devices such as SIMATIC programming devices or S7-300/S7-400 CPUs on the same network. Figure A-28 shows a PROFIBUS network with a CPU 224 and an EM 277 PROFIBUS-DP module. In this situation, the CPU is the DP master and has been configured by a SIMATIC programming device with STEP 7 programming software. The CPU 224 is a DP slave owned by the CPU The ET 200 I/O module is also a slave owned by the CPU The S7-400 CPU is attached to the PROFIBUS network and is reading data from the CPU 224 by means of XGET instructions in the S7-400 CPU user program. A-53

5 SIMATIC programming device S7-300 with CPU DP ET 200B CPU 224 EM 277 PROFIBUS-DP CPU 400 Figure A-28 EM 277 PROFIBUS-DP Module and CPU 224 on a PROFIBUS Network Configuration To use the EM 277 as a DP slave, you must set the station address of the DP port to match the address in the configuration of the master. The station address is set with the rotary switches on the EM 277 module. You must power cycle the CPU after you have made a switch change in order for the new slave address to take effect. The master device exchanges data with each of its slaves by sending information from its output area to the slave s output buffer (called a Receive mailbox ). The slave responds to the message from the master by returning an input buffer (called a Send mailbox ) which the master stores in an input area (see Figure A-29). The EM 277 can be configured by the DP master to accept output data from the master and return input data to the master. The output and input data buffers reside in the variable memory (V memory) of the S7-200 CPU. When you configure the DP master, you define the byte location in V memory where the output data buffer should start as part of the parameter assignment information for the EM 277. You also define the I/O configuration as the amount of output data to be written to the S7-200 CPU and amount of input data to be returned from the S7-200 CPU. The EM 277 determines the size of the input and output buffers from the I/O configuration. The DP master writes the parameter assignment and I/O configuration information to the EM 277 PROFIBUS DP module. The EM 277 then transfers the V memory address and input and output data lengths to the S7-200 CPU. A-54

6 Figure A-29 shows a memory model of the V memory in a CPU 224 and the I/O address areas of a DP master CPU. In this example, the DP master has defined an I/O configuration of 16 output bytes and 16 input bytes, and a V memory offset of The output buffer and input buffer lengths in the CPU 224 (determined from the I/O configuration) are both 16 bytes long. The output data buffer starts at V5000; the input buffer immediately follows the output buffer and begins at V5016. The output data (from the master) is placed in V memory at V5000. The input data (to the master) is taken from the V memory at V5016. Note If you are working with a data unit (consistent data) of three bytes or data units (consistent data) greater than four bytes, you must use SFC14 to read the inputs of the DP slave and SFC15 to address the outputs of the DP slave. For more information, see the System Software for S7-300 and S7-400 System and Standard Functions Reference Manual. VB0 VB4999 VB5000 VB5015 VB5016 VB5031 VB5032 VB5119 CPU 224 V memory Offset: 5000 bytes Output buffer (Receive mailbox): 16 bytes Input buffer (Send mailbox): 16 bytes EM 277 PROFIBUS-DP Module P000 PI256 PI271 PQ256 PQ271 CPU DP I/O address areas I/O input area: 16 bytes I/O output area: 16 bytes VB: variable memory byte P: peripheral PI: peripheral input PQ: peripheral output Figure A-29 Example of a CPU 224 V Memory and I/O Address Area of a PROFIBUS-DP Master A-55

7 Table A-18 list the configurations that are supported by the EM 277 PROFIBUS-DP module. The default configuration for the EM 277 module is two words of input and two words of output. Table A-18 EM 277 Configuration Options Configuration Inputs to Master Outputs from Master Data Consistency 1 1 word 1 word 2 2 words 2 words 3 4 words 4 words 4 8 words 8 words 5 16 words 16 words 6 32 words 32 words 7 8 words 2 words Word Consistency 8 16 words 4 words 9 32 words 8 words 10 2 words 8 words 11 4 words 16 words 12 8 words 32 words 13 2 bytes 2 bytes 14 8 bytes 8 bytes bytes 32 bytes Byte Consistency bytes 64 bytes 17 4 bytes 4 bytes 18 8 bytes 8 bytes bytes 12 bytes Buffer Consistency bytes 16 bytes The location of the input and output buffers may be configured to be anywhere in the V memory of the S7-200 CPU. The default address for the input and output buffers is VB0. The location of the input and output buffers is part of the parameter assignment information that the master writes to the S7-200 CPU. The master must be configured to recognize its slaves and to write the required parameters and I/O configuration to each of its slaves. Use the following tools to configure the DP master: For SIMATIC S5 masters, use COM PROFIBUS Windows software For SIMATIC S7 masters, use STEP 7 programming software For SIMATIC 505 masters, use COM PROFIBUS and either TISOFT2 or SoftShop For detailed information about using these configuration and programming software packages, refer to the manuals for these devices. For detailed information about the PROFIBUS network and its components, refer to the ET 200 Distributed I/O System Manual. A-56

8 Data Consistency PROFIBUS supports three types of data consistency: Byte consistency ensures that bytes are transferred as whole units. Word consistency ensures that word transfers cannot be interrupted by other processes in the CPU. This means that the two bytes composing the word are always moved together and cannot be split. Buffer consistency ensures that the entire buffer of data is transferred as a single unit, uninterrupted by any other process in the CPU. Word and buffer consistency force the CPU to halt any other processes, such as user interrupts, while manipulating or moving the DP I/O data within the CPU. Word consistency should be used if the data values being transferred are integers. Buffer consistency should be used if the data values are double words or floating point values. Buffer consistency should also be used when a group of values all relate to one calculation or item. You set the data consistency as part of the I/O configuration in the master. The data consistency selection is written to the DP slave as part of the initialization of the slave. Both the DP master and the DP slave use the data consistency selection to be sure that data values (bytes, words, or buffers) are transferred uninterrupted within master and slave. Figure A-30 shows the different types of consistency. Master Byte 0 Byte 1 Byte 2 Byte 3 Byte 0 Byte 1 Byte 2 Byte 3 Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Slave Byte 0 Byte 1 Byte 2 Byte 3 Byte 0 Byte 1 Byte 2 Byte 3 Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte consistency Word consistency Buffer consistency Figure A-30 Byte, Word, and Buffer Data Consistency A-57

9 User Program Considerations Once the EM 277 PROFIBUS-DP module has been successfully configured by a DP master, the EM 277 and the DP master enter data exchange mode. In data exchange mode, the master writes output data to the EM 277 PROFIBUS-DP module, the EM 277 module then responds with most current S7-200 CPU input data. The EM 277 module continuously updates its inputs from the S7-200 CPU in order to provide the most recent input data to the DP Master. The module then transfers the output data to the S7-200 CPU. The output data from the master is placed into V memory (the output buffer) starting at the address that the DP master supplied during initialization. The input data to the master is taken from the V memory locations (the input buffer) immediately following the output data. The starting address of the data buffers in V memory and the size of the buffers must be known at the time the user program for the S7-200 CPU is created. The output data from the master must be moved by the user program in the S7-200 CPU from the output buffer to the data areas where it is to be used. Likewise, the input data to the master must be moved from the various data areas to the input buffer for transfer to the master. Output data from the DP master is placed into V memory immediately after the user program portion of the scan has been executed. Input data (to the master) is copied from V memory to the EM 277 for transfer to the master at this same time. Output data from the master is only written into V memory when there is new data available from the master. Input data to the master are transmitted to the master on the next data exchange with the master. SMB200 through SMB249 provide status information about the EM 277 PROFIBUS-DP slave module if it is the first intelligent module in the I/O chain. If the EM 277 is the second intelligent module in the I/O chain, then the EM 277 status is obtained from SMB250 through SMB299. These SM locations show default values if DP communication has not been established with a master. After a master has written parameters and I/O configuration to the EM 277 PROFIBUS-DP module, these SM locations show the configuration set by the DP master. You should check SMB224 to be sure that the EM 277 is currently in data exchange mode with the master before using the information in SMB225 through SMB229 (see Table A-19), or data in the V memory buffer. Note You cannot configure the EM 277 PROFIBUS-DP I/O buffer sizes or buffer location by writing to memory locations SMB225 through SMB229 or SMB275 through SMB279. Only the DP master can configure the EM 277 PROFIBUS-DP module for DP operation. A-58

10 Table A-19 Special Memory Bytes SMB200 to SMB299 DP is First Intelligent Module SMB200 to SMB215 SMB216 to SMB219 DP is Second Intelligent Module SMB250 to SMB265 SMB266 to SMB269 Description Module name (16 ASCII characters) EM277 ProfibusDP S/W revision number (4 ASCII characters) xxxx SMW220 SMW270 Error code 16#0000 No error 16#0001 No user power 16#0002 to 16#FFFF Reserved SMB222 SMB272 DP slave module s station address as set by address switches (0-99 decimal) SMB223 SMB273 Reserved SMB224 SMB274 DP standard protocol status byte MSB S1 LSB S0 S1 S0 DP Standard status byte description 0 0 DP communication not initiated since power on 0 1 Configuration/parameterization error detected 1 0 Currently in data exchange mode 1 1 Dropped out of data exchange mode SMB225 SMB275 DP standard protocol - address of the slave s master (0 to 126) SMW226 SMW276 DP standard protocol - V memory address of the output buffer as an offset from VB0. SMB228 SMB278 DP standard protocol - number of bytes of output data SMB229 SMB279 DP standard protocol - number of bytes of input data SMB230 to SMB249 SMB280 to SMB299 Reserved - cleared on power up Note: SMB225 to SMB229, and SMB275 to SMB279 are updated each time the DP slave module accepts configuration/ parameterization information. These locations are updated even if a configuration/parameterization error is detected. The locations are cleared on each power up. A-59

11 EM 277 PROFIBUS-DP LED Status Indicators The EM 277 PROFIBUS-DP module has four status LEDs on the front panel to indicate the operational state of the DP port: After the S7-200 CPU is turned on, the DX MODE LED remains off as long as DP communication is not attempted. Once DP communication has been successfully initiated (the EM 277 PROFIBUS-DP module has entered data exchange mode with the master), the DX MODE LED turns green and remains on until data exchange mode is exited. If DP communication is lost, which forces the EM 277 module to exit data exchange mode, the DX MODE LED turns OFF and the DP ERROR LED turns red. This condition persists until the S7-200 CPU is powered off or data exchange is resumed. If there is an error in the I/O configuration or parameter information that the DP master is writing to the EM 277 module, the DP ERROR LED flashes red. If user 24 VDC is not provided, the POWER LED will be off. Table A-20 summarizes the status indications signified by the EM 277 status LEDs. Table A-20 EM 277 PROFIBUS-DP Module Status LEDs LED OFF RED FLASHING RED GREEN CPU Fault Module is good Internal Module Failure POWER DP ERROR DX MODE No 24 VDC User Power No Error Not in Data Exchange Mode VDC User Power Good Left Data Exchange Mode Parameterization/ Configuration Error In Data Exchange Mode -- Note When the EM 277 PROFIBUS-DP module is used exclusively as an MPI slave, only the green Power LED is on. A-60

12 Additional Configuration Features The EM 277 PROFIBUS-DP module can be used as a communication interface to other MPI masters, whether or not it is being used as a PROFIBUS-DP slave. The module can provide a connection from the S7-300/400 to the S7-200 using the XGET/XPUT functions of the S7-300/400. STEP 7-Micro/WIN and a network card (such as the CP5611) using the MPI or PROFIBUS parameter set, an OP device or the TD 200 (Rel. 2.0 or greater, order number 6ES AA20-0YA0) can be used to communicate with the S7-200 through the EM 277 PROFIBUS-DP module. A maximum of six connections (six devices) in addition to the DP master can be connected to the EM 277 PROFIBUS-DP module. One connection is reserved for a programming device (PG) and one is reserved for an operator panel (OP). The other four connections can be used by any MPI master. In order for the EM 277 PROFIBUS-DP module to communicate with multiple masters, all masters must be operating at the same baud rate. See Figure A-31 for one possible network configuration. When the EM 277 PROFIBUS-DP module is used for MPI communication, the MPI master must use the station address of the module for all messages that are sent to the S7-200 to which the module is connected. MPI messages sent to the EM 277 PROFIBUS-DP module are passed on to the S The EM 277 PROFIBUS-DP module is a slave module and cannot be used for communication between S7-200 PLCs using the NETR and NETW functions. The EM 277 PROFIBUS-DP module cannot be used for Freeport communication, which is a feature of the S7-200 communication ports. Figure A-31 shows the PROFIBUS-DP MPI Network. PROFIBUS-DP Master S7-300 XPUTS/XGETS Functions STEP 7-Micro/WIN 1 TD 200 1,2 PROFIBUS-DP MPI MPI MPI PROFIBUS-DP/MPI PROFIBUS-DP MPI EM277 PROFIBUS-DP Module S7-22x CPU 1) Communication is possible only to the S7-200 CPUs and the EM277. 2) TD 200 must be Rel 2.0 or greater. Order number 6ES AA20-0YA0. Figure A-31 PROFIBUS-DP/MPI Network A-61

13 Device Database File: GSD Different PROFIBUS devices have different performance characteristics. These characteristics differ with respect to functionality (for example, the number of I/O signals and diagnostic messages) or bus parameters such as transmission speed and time monitoring. These parameters vary for each device type and vendor, and are usually documented in a technical manual. To help you achieve a simple configuration of PROFIBUS, the performance characteristics of a particular device are specified in an electronic data sheet called a device database file, or GSD file. Configuration tools based on GSD files allow simple integration of devices from different vendors in a single network. The device database file provides a comprehensive description of the characteristics of a device in a precisely defined format. These GSD files are prepared by the vendor for each type of device and made available to the PROFIBUS user. The GSD file allows the configuration system to read in the characteristics of a PROFIBUS device and use this information when configuring the network. The latest versions of the COM PROFIBUS or STEP 7 software include configuration files for the EM 277 PROFIBUS-DP Module. If your version of software does not include a configuration file for the EM 277, you can access the latest GSD file (SIEM089D.GSD) at website If you are using a non-siemens master device, refer to the documentation provided by the manufacturer on how to configure the master device by using the GSD file. Listing of the EM 277 PROFIBUS-DP GSD File ;====================================================== ; GSD File for the EM 277 PROFIBUS-DP with a DPC31 ; MLFB : 6ES AA20-0XA0 ; DATE : 07-Oct-1999 ;====================================================== #Profibus_DP ;General parameters GSD_Revision = 1 Vendor_Name = Siemens Model_Name = EM 277 PROFIBUS-DP Revision = V1.00 Ident_Number = 0x089D Protocol_Ident = 0 Station_Type = 0 FMS_supp = 0 Hardware_Release = 1.00 Software_Release = _supp = _supp = _supp = _supp = _supp = 1 500_supp = 1 1.5M_supp = 1 3M_supp = 1 A-62

14 6M_supp = 1 12M_supp = 1 MaxTsdr_9.6 = 60 MaxTsdr_19.2 = 60 MaxTsdr_45.45 = 250 MaxTsdr_93.75 = 60 MaxTsdr_187.5 = 60 MaxTsdr_500 = 100 MaxTsdr_1.5M = 150 MaxTsdr_3M = 250 MaxTsdr_6M = 450 MaxTsdr_12M = 800 Redundancy = 0 Repeater_Ctrl_Sig = 2 24V_Pins = 2 ; Slave-Specification: OrderNumber= 6ES AA20-0XA0 Periphery= SIMATIC S5 Slave_Family=10@TdF@SIMATIC Freeze_Mode_supp = 1 Sync_Mode_supp = 1 Set_Slave_Add_Supp = 0 Auto_Baud_supp = 1 Min_Slave_Intervall = 1 Fail_Safe = 0 Max_Diag_Data_Len = 6 Modul_Offset = 0 Modular_Station = 1 Max_Module = 1 Max_Input_len = 128 Max_Output_len = 128 Max_Data_len = 256 ; UserPrmData-Definition ExtUserPrmData=1 I/O Offset in the V-memory Unsigned EndExtUserPrmData ; UserPrmData: Length and Preset: User_Prm_Data_Len=3 User_Prm_Data= 0,0,0 Max_User_Prm_Data_Len=3 Ext_User_Prm_Data_Const(0)=0x00,0x00,0x00 Ext_User_Prm_Data_Ref(1)=1 ; Module Definition List Module = 2 Bytes Out/ 2 Bytes In - 0x31 Module = 8 Bytes Out/ 8 Bytes In - 0x37 Module = 32 Bytes Out/ 32 Bytes In - 0xC0,0x1F,0x1F Module = 64 Bytes Out/ 64 Bytes In - 0xC0,0x3F,0x3F Module = 1 Word Out/ 1 Word In - 0x70 Module = 2 Word Out/ 2 Word In - 0x71 A-63

15 Module = 4 Word Out/ 4 Word In Module = 8 Word Out/ 8 Word In Module = 16 Word Out/ 16 Word In Module = 32 Word Out/ 32 Word In Module = 2 Word Out/ 8 Word In Module = 4 Word Out/ 16 Word In Module = 8 Word Out/ 32 Word In Module = 8 Word Out/ 2 Word In Module = 16 Word Out/ 4 Word In Module = 32 Word Out/ 8 Word In Module = 4 Byte buffer I/O Module = 8 Byte buffer I/O Module = 12 Byte buffer I/O Module = 16 Byte buffer I/O - 0x73-0x77-0x7F - 0xC0,0x5F,0x5F - 0xC0,0x41,0x47-0xC0,0x43,0x4F - 0xC0,0x47,0x5F - 0xC0,0x47,0x41-0xC0,0x4F,0x43-0xC0,0x5F,0x47-0xB3-0xB7-0xBB - 0xBF Sample Program for DP Communication to a CPU 224 A sample program in Statement List for a CPU 224 that uses the DP port information in SM memory is shown in Figure A-32. Figure A-33 shows the same program in ladder logic. This program determines the location of the DP buffers from SMW226 and the sizes of the buffers from SMB228 and SMB229. This information is used in the program the copy the data in the DP output buffer to the process-image output register of the CPU 224. Similarly, the data in the process-image input register of the CPU 224 are copied into the V memory input buffer. A-64

16 Sample DP program The DP configuration data in the SM memory area provides the configuration of the DP slave. The program uses the following data: SMW220 DP Module Error Status SMB224 DP STATUS SMB225 Master Address SMW226 V memory offset of outputs SMB228 Number of bytes of output data SMB229 Number of bytes of input data VD1000 Output Data Pointer VD1004 Input Data Pointer NETWORK 1 Calculate the Output data pointer into V memory. LDB= SMB224, 2 if ( in data exchange mode ) MOVD &VB0, VD1000 Output buffer is an offset from VB0. ITD SMW226, AC0 Add Vmem offset to get output +D AC0, VD1000 buffer offset NETWORK 2 Calculate the Input data pointer into V memory. LDB= SMB224, 2 if ( in data exchange mode ) MOVD VD1000, VD1004 Get the output pointer address BTI SMB228, AC0 Add the number of output bytes ITD AC0, AC0 to the output pointer to get +D AC0, VD1004 the starting input pointer. NETWORK 3 Set amount of data to be copied. LDB= SMB224, 2 if ( in data exchange mode ) MOVB SMB228, VB1008 Get number of output bytes to copy MOVB SMB229, VB1009 Get number of input bytes to copy NETWORK 4 Transfer Masters Outputs to CPU s Outputs. Copy CPU s inputs to the Master s inputs. LDB= SMB224, 2 if ( in data exchange mode ) BMB *VD1000, QB0, VB1008 Copy master outputs to CPU outputs BMB IB0, *VD1004, VB1009 Copy CPU inputs to Master s Inputs Figure A-32 STL Sample Program for DP Communication to a CPU 224 A-65

17 Network 1 Calculate the output data pointer into V memory. SMB224 ==B 2 &VB0 MOV_DW IN OUT I_DI SMW226 IN OUT ADD_DI VD1000 AC0 AC0 IN1OUT OUT VD1000 VD1000 IN2 Network 2 Calculate the input data pointer into V Memory. SMB224 MOV_DW ==B 2 VD1000 IN OUT VD1004 B_I SMB228 IN OUT AC0 I_DI ACO IN OUT AC0 ADD_DI AC0 AC0 IN1OUT OUT VD1004 Network 3 VD1004 IN2 Set amount of data to be copied. SMB224 MOV_B ==B 2 SMB228 IN OUT Network 4 SMB229 MOV_B IN OUT VB1008 VB1009 Transfer Master Outputs to CPU Outputs. Copy CPU inputs to the Master inputs. SMB224 BLKMO~1 ==B 2 *VD1000 VB1008 IN N OUT OUT QB0 BLKMO~1 IB0 VB1009 IN N OUT OUT *VD1004 Figure A-33 LAD Sample Program for DP Communication to a CPU 224 A-66